Copernicus Sentiel-4/UVN Instrument Calibration System PDR Status

The Sentinel-4 mission is part of the Copernicus programme, whose overall objective is to support Europe’s goals regarding sustainable development and global governance of the environment by providing timely and quality data, information, services and knowledge. Within the Copernicus space component, Sentinel-4 Ultra-violet/Visible/Near-Infrared (UVN) sounder covers the needs for continuous monitoring of atmospheric composition at high temporal and spatial resolution from a geostationary orbit, in particular with respect to air quality. The Sentinel-4/UVN instrument is procured within the ESA Copernicus programme and will be provided to the Meteosat Third Generation (MTG) programme for embarkation on the two MTG-Sounder satellites operated by EUMETSAT. The objective of the geostationary mission Sentinel-4 is monitoring of the composition of the Earth’s atmosphere above Europe. Target species, including the trace gases O3, NO2, SO2, HCHO and aerosols shall be observed to support operational services including forecasts covering air quality protocol monitoring, and climate protocol monitoring. The Sentinel-4/UVN instrument targets the troposphere in particular. The Sentinel-4/UVN instrument is a high resolution spectrometer operating with designated spectral bands in the solar reflectance spectrum, covering the ultraviolet (305-400 nm), visible (400-500 nm) and near-infrared (750-775 nm). The prime Sentinel-4/UVN parameters are a spatial sampling of 8 km over Europe and a fast repeat cycle over Europe and North Africa (Sahara) of one hour. The respective spectral resolutions are 0.5 nm in the ultraviolet and visible spectral bands, and 0.12 nm in the near-infrared. In this presentation the Sentinel-4/UVN instrument calibration (on-ground and in-flight) and the data processing (level 0 to level 1b) to meet the required level 1b data quality status at the beginning of phase C/D are outlined